[Bug 55026] Expose registry save to disk save_period as a configurable option via winecfg

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55026

--- Comment #12 from Artem S. Tashkinov  ---
This patch works. Thanks!

For the future:

* There's some multiplication going on, so this variable has a maximum of
around 280 seconds or something (would be nice if someone told me what's its
maximum is exactly) - which is a bit of bummer.

* wineserver only reads it on startup, so you cannot adjust it at runtime i.e.
dynamically.